Method of making float valve and heat interchange mechanisms



R. H. MONEY 2,152,812.

METHODOF MAKINGFLOAT VALVE AND HEAT .INTERCHANGE MECHANISMS' y April 4, 1939.

NVET'OR. .E0/.Alva H MoNEY.

' Filed Aug; 11,V 195e ATTORNEYS.

UNITED STATES 4PA'I'ENTl OFFICE METHOD vor MAKING FLOAT VALVE AND HEAT m'rEncnANcE `ivrlzcnAivrsMs isolana n. Money,fcinemnau,'ohio, signor to The `Crosley .Corporatlom a corporation of Ohio i Application August 11,1936; Serial No. 95,383

` 2 claims. (cI. 11a-.112)

' In the manufacture of domestic refrigerators, such as have compressors, condensers and evaporators, it has been. the practice in numerous installations to provide means' for feeding the 5 evaporator cnprising a high side float valve mechanism. Generally s'uch a mechanism consists of a chamber having a valve controlledoutlet. the valve being operated by a iloat. Thus the admission of refrigerant to the evaporator l0 is dependent upon the accumulation of` sufcient liquefied refrigerant in the chamber aforesaid, In addition, with certain kinds ofrefi'igerants it is advisable to pre-cool the liquid as it passes to the evaporator. This is accomplished byeiiect ,115 ing heat exchange betweengases withdrawn from the evaporator and the incoming liquid,` preferably at a point where such heat exchangewill be effective to.. provide considerable pre-cooling.

'I'hus the pre-cooling is desirable at or beyond 20 the float valve mechanism.

The objects of my invention generally are the provision of a structure for the purposes hereinabove described which structure has certain novel features, and furtherthe provision ofy a novel,.

' ing the structure. j

s These and the ancillary objects of my inven- 25` convenient and very economical way of providtion will be entirely c1ear-to one skilled in the art upon reading the following specifications. For

3 clarity, reference 'is now made to the drawing wherein;

, Figure 1 is a vertical sectional view through the assembled apparatus* .i

Fig. 2 is a sectional view showing a portion of '35 the apparatus assembled for' joiningby a brazing operation.` e

In the assembly view' of Fig. 1, I have shown a chamber iormedby a cup shaped member I o gether as atl. The 'cup or` domejl isprovided with a charging iltting 4, not requiring Special vand a cap or closure`2, adapted to be welded todescription; andan entrance tting 5 from which a tube 6 leads to the condenser of the refrigerated mechanism. `A suitable screen or lterfl at or near the entrance opening may be provided.

I The cap 2 has' a downwardly projecting sleeve I I `containing a fitting 9- which provides ways for afvalveplunger II). The valve plunger I0 has Va 50 seat II andis operated by a rod I2 pivoted to a' leyer I3, intermediate its ends., 'I'he lever has a I fulcrum or pivotal nconnection to a member I6 'andin turn is pivoted to a float I5, so that as this noat rises clue to the accumulation of liquefied `liliv refrigerantl I8 in the dome .I, theV valve plunger I by-pass tube I8 leads from the cap 2, as shown,

.to the iltting 9; and the end of the tube il may d be cut oi at an angle to provide a connection between the tube I8 and the tube I l internally of theiitting 9. The purpose of the by-pass tube I8 is realized in the charging of the system of the domestic refrigerator initially. If the worhman had to wait for the accumulation of lionefied refrigerantin the dome i to charge the refrigerator, a great deal of time would be consumed. With my device, in charging,.connection is made through the fitting 4 to a suitable source of refrigerant and the apparatus charged, the refrigerant passing through the by-pass tube I8 to the tubel'l land thence to the evaporator; The

passing from the evaporator to the compressor and the warm liqueed refrigerant passing from the condenser to the evaporator,` I provide a housso ing indicated generally in Fig. 1 at I9 surrounding the stm 8 and making a tight connection therewith. I'he housing is made of two cup shaped parts, as will presently be more fully described. Cold gases i'rom the evaporator enter a5 the housing I a through a tube 20 which is connected with the evaporator; and they leave the i housing I 9 through a tube 2| which leads to the I compressor. I Y

It isV an object of my invention to provide a structure such as that hereinabove briey described, which may be very readilyconstructed and very readily assembled. Inv-particular it is an objectoi `my invention'to provide a way of assemblingfp'arts andl brazing them together at a single operation. I'have shown in Fig. 2 a 45 series of parts arranged -for conjoint brazing: Ihe parts .will be brazed together inthe position shown in the ligure, where the cup 2 is utilized to form the-base of the assembled device. The

sleeve gor stem 8 is inserted into the opening in 50 the cp and a ring of copper wire 22 is placed. as shown, above the stem and adjacent the opening'in the,` cup. A spacer member 23 oi collar shape is put over thel'stem 8. the purpose o this being tokeep the heat exchangelhousing 55 A I9 from sliding downwardly on the stem during the brazing operation. It will be appreciated that sufficient space between the housing I9 and the edges of the cup 2 must be left to permit the subsequent welding of the edges of the cupl 2 to the -edges of the dome I. as at 3 in Fig.v 1. Above the collar 23 I prefer to provide another ring of copper wire 24. The `cup shaped member I9a forming part of the housing I9.is next placed on the stem, followed by the upper cup shaped portion I9b, the edges of the cups being interengaged as shown at 25. The cups are `formed by drawing and preferably have inwardly extending sleeves 26, 21 forvengagement respectively with the stem `8 and the tubes 20 and 2i.

About the meeting edges of the cups a copper ring is provided as shown at 29, which may conveniently be a wire wrapped about the cups and twisted to hold it in place, as at 29. i

\ Where the upper cup I9b engages the stem` r 9 another ring of copper 30 will be provided.

The sleeve I4 which provides the fulcrum for the'lever I3 is inserted in the fitting 9 as shown in Fig. 2. This iitting has a longitudinal orifice 3i to provide a bearing for the valve plunger I0. Transversely there may ber provided drilled holes 32 and 33 to relieve the bearing surfaces. A-small by-pass 34 is provided'to conduct lrefrigerant past the valve plunger I0 and into the chamber formed by the hole 32. The valve seat member II hereinabove described is placed in position as shown, and a ring of copper 35 is put in position above it. Likewise a ring of copper 36 is placed near the juncture of the sleeve I4 in the iitting 9, within the stem 8. The sleeve I4 will serve to maintain the iitting 9 and associated parts in place during the welding or brazing operation, since the upper end of the sleeve A may rest on a suitable support. For convenience in handling, the various parts, are preferably so made as to have a frictionalilt. The sleeve I4 may be splitas shown, so as to have resilient engagement with the fitting 9. A ringof copper v3'I may be provided above the lend of the stem 6 and about the fitting 9.

When these parts have been assembled as shown they may be brazed concurrently and in arsingle operation. The assembly of Fig. 2 is merely placed in the position shown, in .a hydrogen brazingA furnace. The various copper i ausgew members melt and the copper ilows in between all meeting parts of the structure. Thus copper derived from the ring 22 brazes the stem 9to the cup 2 and helps to braze the collar 23 to the stem. Likewise copper derived from the ring 24 brazes the lower cup I9a to the stem. Copper from 30 brazes the. upper cup to the stem, while copper from v29 brazes the cups together'. The

collar 23 preventsA the cups from sliding downi wardly upon the stem, for a purpose which has been described. Copper from 3l brazes the tting 9 to the stem 9. Some copper from 36 also acts to do this, and in addition brazes the sleeve I4 to the tting 9. The operations heretofore described can be rapidly carried out and the brazing, of the assembly of Fig. 2 accomplished very rapidly and inexpensively. There remains simply the operation of connecting the oat and lever mechanism, after which the cup 2' is placed in the end of the dome Il and welded theretoby a torch. After this thev tubing 6, I8,

I'I, 20 and 2I may be connected as desired.

Modications may be made in my invention without departing fromthe spirit of it.

v Having thus described my invention, what I claim as new and desire to secure by Letters Patent. is:

` cap', providing a collar surrounding said stem,.

assembling the parts of a housingl about said stem and causing said housing to rest upon said collar, assembling. a sleeve to a fitting, assem-l'A bling a valve seat to Said iittingjinserting the three last mentioned elements in said sleeve,

providing sources of copper at all meeting 'edgesof the elements constituting said assembly, and

brazing said assembly together in a single cpri eration. I

ROLAND H. MONEY. 

